Arrangement for the transmission of speech according to the chan

Details Arrangement for the transmission of speech according to the chan Arrangement for the transmission of speech according to the chan

1982-07-22

1986-03-04

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

Monitoring/measuring of audio devices

Loudspeaker operation

G10L 100

Patent

active

045743924

ABSTRACT:
A synthesizer for a channel vocoder for the transmission of speech with considerable frequency band reduction in digital technology provides a reduction of circuit expense. This is accomplished, given non-recursive filters having finite impulse response, not with a weighting of the pulse-shaped excitation variable with the transmitted envelope values of the spectral channels, but with a time variance of the filters by weighting their filter coefficients with the transmitted envelope values. In addition, with proper dimensioning of the filter coefficients, an optimum speech quality of synthesized speech is obtained at the output of the synthesizer even given elimination of the transmission of a voiced/voiceless signal.

REFERENCES:
patent: 4377793 (1983-03-01), Horna
patent: 4389540 (1983-06-01), Nakamura
patent: 4456893 (1984-06-01), Otani
Freeny, "Special Purpose Hardware for Digital Filtering", Proc. IEEE, Apr. 1975, pp. 633-637.
Flanagan: "Speech Analysis, Synthesis and Perception", 2nd Ed., 1972, pp. 323-330.
Gold et al, "The Channel Vocoder", IEEE Transactions on Audio and Electroacoustics, vol. AU-15, No. 4, Dec. 4, 1967, pp. 148-158.
Gold et al, "New Applications of Channel Vocoders", IEEE Trans. on Acoustics, Speech and Signal Processing", vol. ASSP-29, No. 1, Feb. 1, 1981, pp. 13-23.
Holmes, J. N., "The JSRU Channel Vocoder", IEEE Proceedings, vol. 127, Pt. F., No. 1, Feb. 1980, pp. 53-60.

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